Coupling for tubular lines



Dec. 22, 1942. p scH COUPLINGS FOR TUBULAR LINES Filed May 23, 1959 /nvenlalf .Paa ZZZ/0455012 By Paten ed Dec. 22, 1942 COUPLING FOR TUBULARLINES 1 Paul Maisch, Karlsruhe, Germany; vested in the l Alien PropertyCustodian,

Application May 23, 1939, Serial No. 275,305

. In Germany April 28, 1938.

3 Claims.

the packing surfaces is low during the coupling action so thatthecoupling members can be connected and disconnected by a short movementand small relative rotation of the two coupling members, withoutimpairing the reliable pack-,

ing action against high workingpressures.

With these and further objects in view, as may become apparent from thewithin disclosures, the invention consists not only in the structuresherein pointed out and illustrated by the drawing, but includes furtherstructures coming within the scope of what hereinafter may be claimed.

The character of the invention, however, may be best understood byreference to certain of its structural forms, as illustrated by theaccompanying drawing in which- Figs. 1, 3 and 4-. show axial sections ofthree different embodiments of pipe couplings having the inventionapplied thereto.

Fig. 2 is an end view of the coupling shown in Fig. 1.

Similar reference numerals denote similar parts in the different views.I

Referring now to the drawing in greater detail, and first to Fig. 1,left hand side, and Fig. 2, it

will be seen that the coupling comprises two coupling members I and 2which are provided at their outer ends with female threads for efiectinga screw connection with the associated pipe ends. A packing ring 3 is ofa suitable resilient material, such as, rubber, is provided in anannular recess of the part I and a metallic ring 4 of L-shaped crosssection engages the packing ring 3 and is pressure tightly connected tothe part 2 of the coupling, by means of a bellows or corrugated tube 5forming a pressure-proof seamless joint.

The parts I and 2 are coupled together in known manner, by a bayonetcatch or fixing sys-- tem comprising coupling claws 6 and I which areengaged with each other and locked by rotation through a small angle asbest seen ."from Fig. 2. The ring 4 of the part 2 of the coupling isthereby engaged with the packing ring 3, under slight pressure exertedby the bellows 5.

acting thrust is producedby the annular differ'-' ential surfacecorresponding. to the difference between the mean diameter of theelastic bellows .and the diameterof the ring 4 acted upon by thepressure, whereby the ring 4 is forced against the packing 3 with aforce which grows with in creasing pressure of the working agent flowingthrough the coupling. The forces occurring in an outward direction aretaken up by the interengaged claws 6 and I of theaparts 2 and l.

a In addition, a helical spring 8 may be arranged coaxial with thebellows 5 for pressing the ring 4 against the packing 3v and forming atight joint when the coupling is not acted upon by pressure. 1 r

' It will be clear that in the coupling-shown in Fig. 1, the parts I and2 are relatively turned when they are coupled together, while in thecoupled condition they cannot be relatively turned. Where relativeturning of the two coupling members is required, ,or where the couplingmembers must not be rotated in the couplingoperations, a cap member maybe provided as indicated at H! in Fig. 3. The coupling claws I areprovided on the coupling member I as in Fig. 1, while the cooperatingclaws 6' are provided on the capmembe; I0 which by means of an innerflange l l engages behind an outer flange of the coupling member 2'.- Aspring 8' is in this case provided inside the bellows 5 instead of thesurrounding arrangement of.the spring 8 in Fig. 1. Inthis manner, thebellows can be made correspondingly larger in diameter.

The coupling claws 6 or 6' and I may be interlocked in their engagedpositions, by means of a pawl 9 arranged on a spring i2 secured to themember 2, Fig. 1, or to the member l0, Fig. 3,

for automatic engagement with a corresponding recess 1 in one of theclaws I of the coupling member I.

The elastic or resilient connection between the member 2 and the ring 4may be formed. in any suitable manner so as to be tight againstpressure. Advantageously', a seamless metallic bellows 5 is used, thecorrugation of which permits axial movement of the ring 4. This bellows5 may be connected with the members 2 and 4 by welding,

soldering or screwing to form a pressure-tight joint. I

By way of alternative, a rubber collar or sleeve may be used, as shownat l3 in Fig. 4, and the ends thereof may be connected to the parts 2and 4 by vulcanizing. The outer surface of the sleeve i3 is guided ontubular projections of the members 2 and 4, so as to impart therequisite stillness to the sleeve.

It will be seen from Fig. 1, that the two sides of the coupling aredifferently constructed inasmuch as on the left hand side, a packingring 3 is seated in a recess of the coupling member I, for engagement ofthe projection of the ring 4, while on the right hand side, the twocoupling members i and '4 engage each other directly at l4 resilientring I! which may take any suitable shape and engages the couplingmembers i and 4 resiliently. The latter construction affords anadditional stiffening action of the two coupling members. The couplingmember 2 in Figs. 1 and 4 which is in the form of a sleeve or casing,may consist of two. separate parts which are axially screwed together tofacilitate introduction of the inner parts; the same applies withrespect to the sleeve II in Fig. 3.

I am aware that many further changes may be made and numerousdetails ofconstruction may' be varied through a wide range without'departting fromthe principles of this invention, and I', therefore, do not proposelimiting the patent granted hereon otherwise than is necessitated by theprior art." l

I claim:

l. A coupling for a tubular conduit comprising two coupling members,means for mechanically engaging said members in loosely connectedrela'-. tion, means cooperative with the aforesaid means for lockingsaid members in engaged relation, one of said members including anannular recess, packing means disposed in said recess, a flanged ringhaving a tubular portion extending into of said coupling members" formaintaining a fluid-tight connection between said members.

and are additionally packed by means of a said annular recess in oneof-said coupling means,

a substantially tubular body member connected at one end with one ofsaid coupling members and connected at the opposite end with saidflanged ring, said substantially tubular' body member being axiallyexpansible in the-direction 2. A coupling for a tubular conduitcomprising I two coupling members, means for mechanically engaging saidmembers in loosely connected reia tion, means cooperative with theaforesaid means for locking said members in engaged relation,

one of said members including an annular recess,

packing means disposed in said recess, a flanged ring having a tubularportion extending into said annular recess in one of said couplingmeans, a substantially tubular body member connected at one end with oneof said coupling members and connected at the opposite end with saidflanged ring, said substantially tubular body member being axiallyexpansible in the direction of said coupling and a coil springconcentrically disposed with respect to said substantially tubular bodymember and interposed between one members and said flanged ring.

3. A coupling fora tubular conduit comprising members and connected atthe'opposite" end with said flanged ring, said substantially tubularbody member being axially expansible in fluid-tight connection betweensaid members, and a coil spring concentrically disposed within saidsubstantially tubular body and confined between oneof 'said couplingmembers and said flanged ring member.

- PAUL members for maintaining} a fluid tight connection between saidmembers,-

of said coupling 9 8 means, a substantially tubular body member con;nocted at one end with one; of said coupling the direction. of saidcoupling members for maintaining a-

